Effect of HCl concentration and washing time during the manufacture of pig skin gelatin on the final product quality
1986
Lee, M.H. | Kim, Y.H. (Korea Advanced Inst. of Science and Technology, Seoul (Korea R.))
Raw pig skins purchased from a local processor were cut into the size of 5 cm x 5 cm after trimmed of visible fat. Being washed in tap water for 8-10hr, they were soaked in 1.7% or 5% HCl solution for 15-18hr. Acidified pig skins were rewashed by tap water for either 2 or 10hr prior to the extraction of gelatin at 60 deg C, 70 deg C and 80 deg C. When the rewashing after the acidification was carried out for 10hr, gelatin manufactured with the acidification in 1.7% HCl solution showed superior gel strength than that with the acidification in 5% HCl solution. When HCl concentration was fixed at 1.7%, the rewashing for 10hr resulted in better gelatins in terms of gel strength and viscosity. Chemical composition showed that gelatin with the rewashing for 2hr was higher in lipid content than that with 10hr rewashing
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